Dobby for looms.



-Patentd ont. 10,1899.

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l"UNITED STATES APATENT OFFICE.

GEORGE W. STAFFORD, OF PROVIDENCE, RHODE ISLAND, AssIGNOR 'ro Tun CROMPTON a KNoWLEs LOOM WORKS, oF SAME PLACE.

DOBBY FOR LOOMS.

SPECIFICATION forming part of Letters latent No. 634,632, dated October 10, 1899.' .Application filed June 26,1899. Serial No. 721,857. (No model.)

To a/ZZ whom t may concern:

Beit known that I., GEORGE W. STAFFORD, a citizen of the United States, residing atProvidence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Dobbies for Looms, ot' which the following is a speciiication,reference being had therein to the accompanying drawings. i

The invention has rclationto the devices which are employed in dobbies for the purpose of actuating the knives or litters by means of which the jack-hooks are engaged. and moved to operate the harness-levers and harness-frames.

More particularly the invention involves the hooked rods or links which connect the respective ends of each knife or li-tterwith the corresponding arms of the actuating-rockers. In the case of the old formof the said hooked rods or links upon which I have improved one end of each thereof is merely turned down to form a simple hook, the latter engaging with an eye or the like that is provided at the end of the knife or lifter. In operation the convex or outer side of the hook takes bearing against the interior of the eye in pushing the Y knife or lifter in one direction. 'In time the eye becomes Worn to such an extent that the hook is permitted'to slipvout of place, which result-s in the ensuing movement in breakage of either the hook or the eye.

.Theobject of the invention is to providexa rod or link having a form of hook which will be free from tendency to slip out of position and to occasion breakage in consequence of the wear aforesaid. y

The accompanying drawings illustrate a practical Vembodiment of the invention and also present by way of contrast the old form of hook which my invention is designed to supersede.

In the drawings, Figure l shows in side elevation a portion of a dobhy having the said embodiment of the invention applied thereto. Dnly such parts of the dobby are shown as are required to be presented in order to make clear the nature and relations of the' invention. Fig. 2 is a detail view showing the old` form of hooked rodor link.

Reference will be had first to the parts in general which are shown in Fig. l. o, designates a portion of the dobby-frame, and o. the patterncylinder- The rocker at one side ofthe dobby is shown at a2, the swivel applied to the 0.4 is a hooked rod or link, it having its stem passed through the said swivel and adjustably seen red rel ativelythereto by means of the nuts 01,5 a5 upon' the screw-threaded portion of the said stem at opposite sides of the swivel. a6 is the hooked end of the said rod or link. al is the eye orits equivalent, in which the 'said hooked end of the rod or link a4 engages, and a8 is one of the knives orlifters, it being provided at the end thereof which is shown in Fig. l with the said eye a?. The slot or guideway in which the end of knife or lifter as moves is designated a9.

Having reference to Fig.l2, the hooked rod or link therein is designated am and is of the old form to which reference has been made hereinbefore. It will be perceived that, as stated, the hook au thereof is formed merely by turning down the `endiof the rod or link into a simple hook having its convex side turned outermost, so that the push by which the movement of the knife or litter in one direction is occasioned is transmitted bythe said convex side to the eye of the knife or lifter. Y AIt. will be understood thatrin the form of dobby which-ispartially represented in the drawings it is in the outward movement of the knife or lifter that the latter does its main Work-'t'. e., engages with the selected jackhooksand carries them outward for the purpose of. operating the corresponding harness-v levers and raising the required harnessframes. The main resistance tothe movement of the knife or lifter, tending to occasion wear between the eye o? and 'the hook working therein, therefore, in the said form of dobby, is encountered in the outward movement of the parts. l

The tendency of the hook a in Fig. 2 to Work out of place will increase in proportion as the parts wear at the places of contact.

(shown in Fig. l) is the fact 4that it is recurved lower arm of the said rocker being shown at d3.

The characteristic of the improved hook o.6v

or reversed, whereby the convex side thereof is presented toward the rocker a2, so that in the movement which carries the knife or lifter L8 outwardly the push is transmitted by the eoneave side of the hook a to the eye al. It will be perceived that the form of the said iinproved hook a is such that it [its seeurely in place in eye a7 and merely roeks slightly in the said eye in consequence of the curvilinear path of the point of Connection of the hooked rod or link a4 with the rocker. It Cannot by anypossibility, in Consequence of any amount of Wear, work out of piace, so as to occasion breakage. 

